Opencode review suggestion #1 - #4

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-dotnet@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Possible null reference argument for parameter 'buffer' in 'void MemoryStream.Write(byte[] buffer, int offset, int count)'.

Possible null reference argument for parameter 'sourceArray' in 'void Array.Copy(Array sourceArray, int sourceIndex, Array destinationArray, int destinationIndex, int length)'.

Possible null reference argument for parameter 'buffer' in 'void MemoryStream.Write(byte[] buffer, int offset, int count)'.